Bug 1949859 [wpt PR 50879] - Fix a crash in AILanguageDetectorFactory::capabilities() called on a detached frame, a=testonly

Automatic update from web-platform-tests
Fix a crash in AILanguageDetectorFactory::capabilities() called on a detached frame

- Add [RaisesException] EA to AILanguageDetectorFactory::capabilities(), raise an exception when no execution context is present;
- See if execution context is available before calling GetLanguageDetectionDriverRemote()
- Add a CHECK() within GetLanguageDetectionDriverRemote() to enforce that.

Bug: 384233287
Change-Id: I81486a91cf2cdc270562615ccbc4a91720ec3ff7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6289147
Commit-Queue: Andrey Kosyakov <caseqchromium.org>
Reviewed-by: Mike Wasserman <mswchromium.org>
Cr-Commit-Position: refs/heads/main{#1423264}

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wpt-commits: b26ba1d0251ab1e9db078ba18c83a953cfaeb580
wpt-pr: 50879

UltraBlame original commit: 7d75f7540c56ad68dde612e450e954020a8d8087

Author: marco-c

testing/web-platform/tests/ai/language_detection/capabilities-detached-crash.tentative.https.html

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